You should check out www.stumbleupon.com

Its basically a toolbar that you set up in your browser, and you click a button and it brings you to a random website. There are hundreds of categories you can choose from. You can also set it to disallow adult sites(or allow, if thats your bag LOL) so that you dont get anything nasty.

I have wasted countless hours on stumbleupon between random information, games, pictures, jokes and whatnot!